The swapcase Method in Python: Inverting Character Case in a String

The swapcase method returns a copy of the string with each letter’s case inverted. Lowercase letters become uppercase, and uppercase letters become lowercase.

swapcase()¶

'Cat TrIckster!'.swapcase()  # cAT tRiCKSTER!

For 8-bit Unicode strings, the method’s result can vary based on the locale. Therefore, the following expression is not always true:

if "string".swapcase().swapcase() == "string": ...